ES2666881T3 - Radio transmission device, and radio transmission procedure based on compensation information to adjust the data coding rate and control information coding rate - Google Patents

Abstract

Transmission method for use by a transmission apparatus for transmitting data and control information in a single carrier system, the procedure comprising: determining a first coding rate for the data based on a CQI, the CQI being transmitted from a base station ; calculate a second coding rate for the control information; transmit the data using the first encoding rate for the data; and transmitting the control information using the second coding rate for the control information, in which the second coding rate for the control information is calculated based on both the CQI and a CQI compensation transmitted from the base station, and a CQI compensation value is used to calculate the second coding rate for the control information.

Description

image 1

DESCRIPTION

Radio transmission device, and radio transmission procedure based on compensation information to adjust the data coding rate and the control information coding rate.

5 Technical Field The present invention relates to a radio transmission apparatus and a radio transmission method used in a communication system that employs an adaptive modulation scheme.

10 State of the art Currently, in the 3GPP RAN LTE (Long-Term Evolution) uplink, to obtain a low PAPR (ratio between maximum and average power), the focus is on single carrier transmission. In addition, a program to select a pattern of MCS (Modulation and Coding Scheme) by user according to a CQI (Channel Quality Indicator) of the user and perform adaptive modulation and coding is studied

15 (AMC) for high performance (for example, see non-patent document 1).

In addition, to perform adaptive modulation and coding, a multiplexing technique of a control channel required to decode a data channel with the data channel and transmit the multiplexed channel is known (for example, see non-patent document 2 ). Non-patent document 2 defines an SDCH (Data Channel

20 Programmed) as a data channel and defines a SCCH (Programmed Control Channel) as a control channel.

Non-patent document 1: 3GPP TS25.211 v6.5.0, June 2005 Non-patent document 2: 3GPP TSG RAN1 R1-050679, June 2005

Description of the invention Problems to be solved by the invention

To focus a subframe format studied in RAN 3GPP LTE, when a plurality of channels, such as an SCCH and SDCH are multiplexed, a possible frame configuration is where a pilot channel is in

A SB (Short Block) and the SCCH and SDCH are multiplexed by time division into an LB (Long Block). Figures 1 and 2 show specific examples of frame configurations in which the SCCH and SDCH are multiplexed by time division.

Figures 1 and 2 also show the transmission power of the SCCH and SDCH. As shown in these

35 figures, there are cases in which the difference in transmission power between the SCCH and the SDCH increases due to the following reasons.

Like the MCS for the SCCH, all users commonly use a diffusion factor, a modulation scheme and a diffusion coding rate at which the required CNR is low, so that even a

40 user in a poor reception environment can meet the required quality. That is, in 3GPP RAN LTE, adaptive modulation and coding is carried out, and thus the MCS pattern for the SDCH varies differently, while the MCS pattern for the SCCH (not including the transmission power) is permanent.

However, to reduce level fluctuation errors due to fading and ensure quality

45 required from the SCCH, the transmission power for the SCCH is controlled so that the transmission power per user is varied according to the power received from each user.

That is, the transmission power for the SCCH varies through the transmission power control, while the transmission power for the SDCH varies through adaptive coding and modulation and, therefore,

50 the transmission power for the SCCH and the transmission power for the SDCH vary independently of each other. Therefore, as shown in Figure 1, the transmission power for the SCCH may be greater than the transmission power for the SDCH or, as shown in Figure 2, the transmission power for the SCCH may less than the transmission power for the SDCH.

55 In both cases, the difference in transmission power between the SCCH and the SDCH becomes large. Consequently, the PAPR for the transmission signal that includes these two channels shows a high value and, thus, it is necessary to provide a sufficient reduction of the power of the transmission amplifier and a decrease of the total transmission power in the transmission with in order not to cause a distortion in the transmission signal. As a result, the required quality of these two channels cannot be obtained and the

60 communication system performance.

Therefore, an objective of the present invention is a radio transmission apparatus and a radio transmission method capable of improving the performance of the communication system by making the difference in transmission power between the SCCH and the SDCH small, suppressing an increase in PAPR, and making it easier to meet the required quality of the two channels.

image2

Means to solve the problem

The radio transmission apparatus of the present invention determines an MCS of the transmission signal based on a CQI reported from a communication part and adopts a configuration that includes: a determination section that determines an MCS for a data channel based on the CQI reported from the communication part and determines an MCS for a control channel based on the same CQI; and a transmission section that transmits the transmission signal that includes the data channel and the control channel.

Advantageous effect of the invention In accordance with the present invention, it is possible to suppress an increase in PAPR, making it easier to satisfy the required quality of the two channels and improve the performance of the communication system.

15 Brief description of the drawings Figure 1 shows a specific example of a frame configuration where an SCCH and an SDCH are multiplexed by time division; Figure 2 shows another specific example of the frame configuration in which the SCCH and the SDCH are multiplexed by time division;

Figure 3 is a block diagram showing a main configuration of a communication apparatus according to embodiment 1; Fig. 4 is a block diagram showing a main internal configuration of an MCS selection section according to embodiment 1; Figure 5 shows an example of the content of a CQI query table according to embodiment 1;

Figure 6 shows an example of a frame format of a transmission signal, where an SCCH and an SDCH are multiplexed; Fig. 7 is a block diagram showing a main configuration of a communication apparatus according to embodiment 2; Figure 8 is a block diagram showing a main internal configuration of a selection section

MCS 30 according to embodiment 2; Figure 9 shows an example of the content of a CQI query table according to embodiment 2; Fig. 10 is a block diagram showing a main configuration of a communication apparatus according to embodiment 3; Figure 11 is a block diagram showing a main internal configuration of a section of

Decoding according to embodiment 3; Figure 12 shows an example of a signal format, where CQI information and a CQI compensation command are multiplexed; Fig. 13 is a block diagram showing a main internal configuration of an MCS selection section in accordance with embodiment 3;

40 Figure 14 specifically illustrates how a CQI is actually corrected by the CQI compensation command; and Figure 15 is a block diagram showing a main configuration of a communication apparatus provided with a radio receiving apparatus according to embodiment 3.

Best way to carry out the invention

In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings. A case will be described here in which the DFT-s-OFDM scheme (orthogonal frequency division multiplexing with discrete Fourier transform spread) is used, that is, a single carrier communication scheme as a communication scheme.

50 (Embodiment 1) Figure 3 is a block diagram showing a main configuration of a communication apparatus provided with a radio transmission apparatus according to embodiment 1 of the present invention.

This communication apparatus is primarily configured with a reception section 100 and a communication section.

Transmission 110. The reception section 100 has a radio reception section 101, a CP removal section 102, an FFT section 103, a demodulation section 104, a decoding section 105 and an estimation section of channel 106, and a transmission section 110 having an MCS selection section 111, and coding and modulation sections 112 and 113, a multiplexing section of channel 114, a DFT-s-OFDM section 115, an addition section of CP 116 and a radio transmission section 117.

60 The sections of the communication apparatus described above perform the following operations.

image3

The radio reception section 101 of the reception section 100 converts the signal received through the antenna 120 into a baseband signal and sends the baseband signal to the CP removal section 102. The CP removal section 102 performs a deletion processing of a part of a CP (Cyclic Prefix) of the baseband signal sent from the radio reception section 101, and sends the signal obtained to the section of FFT 103. The section of FFT 103 performs a fast Fourier transform (FFT) on the time domain signal sent through the CP 102 elimination section, and sends the obtained frequency domain signal to the signal demodulation section 104 and the estimation section of channel 106. The channel estimation section 106 estimates a channel environment of the received signal using a pilot signal included in the signal sent from the FFT section 103, and shows the estimated result The signal demodulation section 10 104. The signal demodulation section 104 performs a channel compensation on a signal in which the control information such as a pilot signal (data information) of the received signal submitted is extracted. to the processing of the Fourier transform in the FFT section 103, based on the estimated result of the channel environment sent from the channel estimation section 106. In addition, the demodulation section 104 performs a demodulation processing of the signal subjected to channel compensation based on the same MCS as

15 uses in the radio transmission apparatus, that is, the same modulation scheme, coding rate, and the like, as the radio transmission apparatus, and sends the result to the decoding section 105. The decoding section 105 performs an error correction on the demodulated signal and extracts a sequence of information data and CQI information from the received signal. The CQI information is sent to the selection section of MCS 111.

20 Meanwhile, the MCS selection section 111 of the transmission section 110 determines the MCS pattern of an SDCH (MCS 1), the MCS pattern of an SCCH (MCS 2) and information regarding the multiplexing position of these two channels in the time domain (multiplexing information), based on the CQI information sent from the decoding section 105 with reference to a CQI query table described more

25 forward. The MCS 1 is sent to the coding and modulation section 113, the MCS 2 is sent to the coding and modulation section 112, and the multiplexing information is sent to the channel multiplexing section

114

The coding and modulation section 113 performs coding and modulation processing on data of

30 user input (transmission data sequence) based on the MCS pattern (MCS 1) sent from the selection section of MCS 111, and generates transmission data for the SDCH and an IR pattern used in the coding. The transmission data for the SDCH is sent to the multiplexing section of channel 114, and the IR pattern is sent to the coding and modulation section 112.

35 The coding and modulation section 112 performs coding and modulation processing on control information such as the IR pattern sent from the coding and modulation section 113, based on the MCS pattern sent from the MCS selection section 111 , and generates transmission data for the SCCH. The transmission data generated for the SCCH is sent to the multiplexing section of channel 114.

40 The multiplexing section of the channel 114 multiplexes in time division the transmission data for the SCCH and the SDCH sent from the coding and modulation sections 112 and 113 in accordance with the multiplexing information sent from the MCS selection section 111. The transmission of multiplexed data is sent to the DFT-s-OFDM 115 section.

45 The DFT-s-OFDM 115 section performs a discrete Fourier transform (DFT) on the transmission data sent from the multiplexing section of the channel 114, performs a time-frequency conversion into time series data, and obtains a frequency domain signal. Upon assignment of the frequency domain signal in transmission subcarriers, the DFT-s-OFDM section 115 performs the inverse processing of the Fourier fast transform (IFFT) and converts the frequency domain signal into a domain signal

50 of time. The time domain signal obtained is sent to the CP 116 addition section.

The CP 116 addition section adds a CP per block of transmission data by duplicating data in the queue of a block per block of transmission data sent from the DFT-s-OFDM 115 section and inserting the duplicated data at the beginning of the block, and send the result to the radio transmission section 117.

55 The radio transmission section 117 converts the baseband signal sent from the CP 116 addition section to a radio frequency band, and transmits the result through the antenna 120.

Figure 4 is a block diagram showing the main internal configuration of the selection section of

60 MCS 111. The information selection section 121 determines MCS 1 for the SDCH, MCS 2 for the SCCH and multiplexing information based on the CQI entered with reference to the CQI query table 122 shown in Figure 5.

image4

Figure 5 shows an example of the content of a CQI 122 query table as described above. A case will be described here as an example in which modulation schemes of BPSK (binary phase compensation modulation), QPSK (quadrature phase compensation modulation) 16 QAM (quadrature amplitude modulation) and 64 QAM are used, coding rates of 1/3, 1/2, 2/3, 3/4 are used,

5 5/6 and 7/8, and, only for BPSK, repetition factors (RFs) of 1, 2, 4, 8, 16 and 32 are used.

For example, if CQI = 7, the information selection section 121 selects a QPSK modulation scheme, an encoding rate of 3/4 and a repetition factor of 1 for the SDCH with reference to the CQI query table 122, and collectively sends them as MCS 1. In addition, the information selection section 121

10 uses the same CQI = 7, selects a QPSK modulation scheme, a 1/3 coding rate and a repetition factor of 1 that matches CQI = 7 for the SCCH, and sends them as MCS 2. From this Thus, from Figure 5 it can be understood how MCS 1 for SDCH and MCS 2 for SCCH is established in association with each other for each CQI.

15 In this CQI 122 query table, the MCS 2 for the SCCH is established by the following procedure in accordance with the MCS 1 for the SDCH established on the basis of CQI.

First, the MCS for the SDCH is determined for each CQI. Next, an average SDCH transmission rate per CQI is calculated, and the MCS for the SCCH is determined using the following determination procedure. That is, assuming that the average SDCH transmission rate is A, the number of SDCH symbols is B, the PER (packet error rate) when MCS 1 (for example, QPSK and R = 1/2) is selected so that the SCCH is C, the PER when MCS 2 (for example, QPSK and R = 1/3) is selected so that the SCCH is D, and the difference between the number of SCCH symbols (MCS 1) and the number of symbols of the SCCH (MCS 2) is E, and, comparing "A × (1-C)" with "A × (1-D) x (E + B) / B", with the MCS presenting the highest value, it is say the MCS that has

25 the highest transmission rate, the MCS is made for the SCCH. In addition, both (1-C) and (1-D) represent a rate of decrease of the SDCH transmission rate due to SCCH reception errors, and (E + B) / B represents a rate of rate increase SDCH transmission when SCCH resources become SDCH resources.

30 In other words, in the CQI 122, MCS 1 and MCS 2 lookup table they are established so that the PAPR for the SCCH and SDCH are within the range of the assumed PAPR and a transmission rate of the SCCH and the SDCH becomes maximum.

In addition, in Figure 5, the multiplexing information A to P is information as described below. The

Figure 6 shows an example of a frame format of a transmission signal in which an SCCH and an SDCH are multiplexed.

This figure shows a frame format of the transmission signal when the CQI is different, for example, a transmission signal when the CQI is 2, shown at the top, and a transmission signal when the CQI 40 is 9, shown on the bottom. Thus, when the SCCH is assigned at the beginning and the SDCH is assigned after the SCCH, the number of transmission data for the SCCH, that is, the number of SCCH symbols, varies according to the CQIs, and thus the Initial position of the SDCH varies. Therefore, in this embodiment a plurality of types of information are established that show the starting position of the SDCH by the CQI query table 122 as information (multiplexing information) relative to the multiplexing position of the two channels.

45 in the time domain. The multiplexing section of the channel 114 acquires multiplexing information for each CQI established in the CQI query table 122 through the information selection section 122 in the MCS selection section 111, and multiplexes the SCCH and SDCH using this multiplexing information.

Here, the amount of information before encoding, which is transmitted using the SCCH, is a fixed rate,

50 regardless of the MCS for the SDCH. Therefore, in particular, when the CQI is high, more SCCH transmission symbols can be reduced after coding and modulation than in the case where the CQI is low, and the SCCH symbol resources can be used as resource resources. SDCH symbols (resources of a diagonal part in Figure 6), so that it is possible to further improve SDCH performance.

In addition, CQI reference table 122 is also provided to a radio reception apparatus that supports the radio transmission apparatus according to this embodiment, and thus the information set forth in the CQI reference table 122 is known among the transmission side and reception side.

Thus, according to this embodiment, in the single carrier transmission where a

60 plurality of channels, the MCS pattern for each channel is set in a CQI table (CQI query table 122) according to CQIs so that the difference in transmission power between the SCCH and the SDCH is kept within of a predetermined interval. The radio transmission apparatus according to this embodiment acquires MCS patterns for SCCH and SDCH channels according to CQIs with reference to this CQI table, performs adaptive modulation and coding based on these MCS patterns and generates a transmission signal . By this means, it is possible to maintain a low PAPR of the transmission signal, and thus it is more likely to satisfy the required quality of the two channels. That is, it is possible to improve the performance of the communication system.

image5

5 In addition, according to this embodiment, by varying the pattern of MCS for the SCCH, it is more likely to meet the quality required for the SCCH, so a transmission power control in the SCCH is not required. The transmission power does not fluctuate independently of each other between a plurality of channels. Therefore, while maintaining a low PAPR, the two channels are more likely to meet the required quality, so that it is possible to improve the performance of the communication system.

In addition, according to this embodiment, the SCCH and the SDCH are set in the same CQI table to correspond to the same CQI, and this CQI table is shared between the transmission side and the reception side. By this means, the radio reception apparatus that supports the radio transmission apparatus according to this embodiment may acquire information related to the MCS for the SCCH with reference to the CQI table

15 shared between the transmission side and the reception side based on the reported CQI, and it is not necessary that you separately acquire information related to the MCS for the SCCH from the radio transmission apparatus according to this embodiment. That is, a new signal sending is not required.

In this embodiment, the SCCH and SDCH are shown as examples of a plurality of channels subjected to

Time division multiplexing, but the channels to which the present invention is directed are not limited thereto and, for example, the present invention can also be directed to three or more channels having different required quality or may be directed to channels that use different coding schemes. In addition, an example has been described in which time division multiplexing is performed in the SCCH, followed by the SDCH, but this is not in any limiting sense and, for example, time division multiplexing is performed in the

25 SDCH, followed by SCCH.

In addition, a case has been described with this embodiment in which the CQI 122 query table is structured so that different MCS patterns and the like are set for different CQIs, but the CQI 122 query table may be structured so that the same MCS pattern is established

30 for different CQIs.

In addition, the CQI 122 query table can be structured so that different MCS patterns are established per bandwidth to be used.

In addition, in this embodiment, the CQI query table 122 may be structured so that the SCCH and SDCH are interleaved in a subframe in the time domain.

In addition, in this embodiment, the CQI reference table 122 may be structured so that the MCS described above and the like are added, and the number of pilot symbols and the position of

40 multiplexing of this pilot.

(Embodiment 2) Figure 7 is a block diagram showing the main configuration of the communication apparatus provided with the radio transmission apparatus according to the embodiment 2 of the present invention. This device of

The communication presents a basic configuration similar to the communication apparatus described in embodiment 1 (see figure 3), and the same reference numbers will be assigned the same reference numbers without further explanation.

The communication apparatus according to this embodiment also has a section for establishing

50 power difference 201 and a power control section 202, and the transmission power of the SCCH is controlled. However, predetermined limits are established on the difference in transmission power between the SCCH and the SDCH, and thus the transmission power can satisfy the required PAPR even if the transmission power is controlled. This is different from embodiment 1.

Figure 8 is a block diagram showing the main internal configuration of the selection section of MCS 111a.

The selection section of MCS 111a performs the same basic operations as the selection section of MCS 111 described in embodiment 1, but is different from embodiment 1 in which the selection section of 60 MCS 111a sends (the value of setting of) transmission power and information of the transmission power difference, in addition to the information of MCS 1 for the SDCH and the like. Therefore, the same reference numbers are assigned as the MCS selection section 111, and, to distinguish the MCS selection section

image6

of embodiment 1, the letter "a" is assigned to reference number 111. For other components, letters are added for the same reason.

Figure 9 shows an example of the CQI content of the CQI query table 122a.

5 In the CQI reference table 122a, when the CQI level is maintained within the range of 1 to 8, that is, when the CQI level is low, the transmission power is set to the same value of 27 dB. On the other hand, when the CQI level is maintained within the range of 9 to 16, that is, when the CQI level is high, the transmission power is established with different values of 19 to 26 dB, depending on the CQI level.

10 In addition, the transmission power difference is set at 0 dB when the modulation scheme for the SDCH and the modulation scheme for the SCCH are equal, that is, the transmission power for both channels is set with the same value. On the other hand, when the modulation scheme for the SDCH is different from the modulation scheme for the SCCH, the transmission power difference is established with a

15 value other than 0 dB. Here, although the difference in transmission power is established with values other than 0 dB, the value is not unlimited, and values are established that range between 0.5 and 3.5 dB and satisfy the following conditions . The reasons for this include, if the modulation schemes are different, the PAPR becomes different in principle, and so, when the modulation scheme for the SDCH is different from the modulation scheme for the SCCH, even if the PAPR difference, in principle it is established as a

20 power difference, the overall PAPR does not increase, and the channel performance can be improved using the modulation scheme that has the lowest PAPR.

In addition, if CQI = 16, for example, the modulation scheme for the SDCH is 64 QAM, while the modulation scheme for the SCCH is QPSK, and there is a large difference in the transmission rate and robustness of error 25 ( which has a compensation relationship) between these two modulation schemes. In this case, if the transmission power for the SDCH that has a low error robustness is set low by the transmission power control, the PAPR can be increased to the point that it does not cause distortion by a transmission amplifier, and the transmission power difference is set to a maximum of 3.5 dB, so that the transmission power for the SCCH that has a high robustness of error is set as high as possible to

30 make SCCH errors less likely.

Thus, in accordance with this embodiment, when the modulation schemes for a plurality of channels are different, the transmission power difference is established per channel in order not to increase the PAPR. By this means, when there is any difference in PAPR between the plurality of channels, it is possible to maintain

35 a low PAPR and improve performance for each channel.

In addition, according to this embodiment, if the CQI level is low, the transmission power is set to a constant value. That is, if the CQI level is low, no transmission power control is performed. By this means, it is possible to maintain a low PAPR and improve the performance for each channel.

40 (Embodiment 3) Figure 10 is a block diagram showing the main configuration of the communication apparatus provided with the radio transmission apparatus according to the embodiment 3 of the present invention. This communication device also has the basic configuration similar to that of the communication device described in the

45, embodiment 1, and the same reference numbers will be assigned to the same components if further explanations are made.

The communication apparatus according to this embodiment receives a CQI and a CQI compensation command and corrects the MCS finally selected for the transmission signal by correcting the CQI level for the SCCH or SDCH. To be more specific, the decoding section 105b extracts a sequence of information data

50 transmitted from a demodulated received data stream, extracts the CQI information and CQI compensation information, and sends the extracted data sequence and information to the selection section of MCS 111b.

Figure 11 is a block diagram showing the main internal configuration of the decoding section 105b.

Channel division section 301 divides the demodulated data stream into the data channel and the control channel, and sends these channels. The error correction and decoding section 302 performs error correction and decoding in the data channel sent from the channel division section 301, and sends the obtained data 60, that is, the user data. On the other hand, the error correction and decoding section 303 performs the error correction and decoding in the control channel sent from the channel division section 301, and sends the obtained control data to the data division section. of control

304. The control data division section 304 extracts CQI information and a CQI compensation command from the control channel based on the predetermined control data assignment information, and sends the extracted information and the command to the MCS 111b selection section.

image7

Figure 12 shows an example of a signal format in which CQI information is multiplexed and a CQI compensation command 5 that is received in the control data division section 304.

Figure 13 is a block diagram showing the main internal configuration of the selection section of MCS 111b.

10 The information selection section 121b first determines MCS 1 for the SDCH according to the CQI information with reference to the CQI query table 122 described in embodiment 1. The information selection section 121b then acquires a command of CQI compensation with reference to the CQI 122 query table in the same way. This CQI compensation command is specifically "-1" or "0 (no compensation)". Information selection section 121b adds this CQI compensation command to the

15 CQI information, and determines MCS 2 for the SCCH according to the new corrected CQI information. The multiplexing position is determined when MCS 2 is determined, and thus MCS 1, MCS 2 and multiplexing information are sent.

If the CQI compensation command is "-1", it means that the robustness of the CQI error improves in a single stage.

20 Thus, making the degree of compensation of the CQI a stage, the required PAPR does not vary. The CQI reference table 122 originally establishes the MCS patterns for the SCCH and SDCH that satisfy the required PAPR. Therefore, the required PAPR must be satisfied by selecting the MCS pattern for each channel according to this CQI table and, therefore, the MCS patterns, which are clearly outside this CQI table, should not be selected. The degree of compensation of the CQI becomes a stage in order to minimize the degree of

25 compensation.

Figure 14 specifically illustrates how the CQI is actually corrected by the CQI compensation command described above. In addition, the CQI table shown here is the same as that shown in embodiment 1 (see Figure 5).

30 For example, if CQI = 8 and the compensation command of CQI = -1, QPSK, R = 5/6 and RF = 1 are first selected as MCS 1 for the SDCH. Next, CQI = 8 in MCS 2 for the SCCH, and thus the compensation command of CQI = -1 is added, and with this the CQI is corrected according to CQI = 7. Therefore, the MCS 2 corrected for the SCCH It includes QPSK, R = 1/3 and RF = 1 (diagonal part in Figure 14), and has an encoding rate with a

35 high robustness of error.

In addition, the CQI compensation command described above is reported with the CQI from the radio receiving apparatus that supports the radio transmission apparatus in accordance with this embodiment. Next, the procedure for generating a CQI compensation command in the receiving apparatus will be described.

40 radio

Figure 15 is a block diagram showing the main configuration of the communication apparatus arranged in the radio receiving apparatus described above. In addition, a radio reception section 151, a CP elimination section 152, an FFT section 153, a channel estimation section 156, 45 coding and modulation sections 162 and 163, a channel multiplexing section 164, a section of DFT-s-OFDM 165, an addition section of CP 166 and a radio transmission section 167 employ the same configuration as the radio reception section 115, the removal section of CP 101, the removal section of CP 102, the FFT section 103, the channel estimation section 106, the coding and modulation sections 112 and 113, the channel multiplexing section 114, the DFT-s-OFDM section 115, the section

50 addition of CP 116 and the radio transmission section 117 of the communication apparatus described in embodiment 1, respectively, whereby the explanations thereof will be omitted.

The frequency equalization section 171 performs a frequency equalization processing of the signal sent from the FFT section 153, and sends the result to the DFT section 172.

55 The DFT section 172 performs a discrete Fourier transform processing of the signal sent from the frequency equalization section 171, and sends the result to the demultiplexing section of channel 173.

The demultiplexing section of channel 173 demultiplexes the signal sent from the DFT section 172 in a

60 SDCH signal and an SCCH signal, send the SDCH signal to decoding section 174, and send the SCCH signal to decoding section 175.

5

10

fifteen

twenty

25

30

35

40

Four. Five

fifty

55

60

The decoding sections 174 and 175 decode the SDCH and SCCH sent from the demultiplexing section of channel 173 and send the results.

The calculation section of the CQI compensation command 176 calculates a CQI compensation command based on an average error rate of the received SCCH, and sends the CQI compensation command to the coding and modulation section 162 of the transmission 160. To be more specific, when the average error rate of the SCCH is equal to or greater than a predetermined threshold, that is, when the average error rate of the SCCH does not meet the required quality, "-1" is set for the CQI compensation command and, when the average SCCH error rate is less than the default threshold, "0" is set for the CQI compensation command.

The calculation section of CQI 177 calculates a CQI to report based on the level received of the received pilot signal power, noise power and interference power, and sends the CQI for the coding and modulation section 162 of the transmission section 160.

Thus, according to this embodiment, the CQI level for one of the SCCH and the SDCH is corrected based on the CQI compensation command. By this means, when the quality required for one of the channels cannot be satisfied, by correcting the CQI for this channel an MCS pattern lower than the required CNR can be used, and the performance can be improved for each channel.

Although a case has been described above as an example in this embodiment in which the CQI compensation command includes two values of "-1" and "0", the CQI compensation command includes three values of "-1", " 0 "and" 1 "or more than three values.

In addition, although an example has been described with this embodiment in which the degree of CQI compensation is a stage (when the CQI compensation command is "-1"), the degree of CQI compensation can be two-stage or more using other values such as a CQI compensation command "-2" within a range where the PAPR does not vary.

Embodiments of the present invention have been described.

The radio transmission apparatus and the radio transmission method according to the present invention are not limited to the embodiments described above, and can be implemented with various modifications. For example, the embodiments may be combined as appropriate and implemented.

The radio transmission apparatus according to the present invention can be arranged in a mobile station apparatus and a base station apparatus in a mobile communication system and, therefore, it is possible to arrange a mobile station apparatus system, a base station apparatus and a mobile communication system that have the same operating effects as described above.

In addition, the radio transmission apparatus and the radio transmission method according to the present invention can be used in the communication system using communication schemes other than single carrier communication.

In addition, the SCCH in the embodiments described above may be a DACCH (Associated Data Control Channel) or a DNACCH (Non Associated Data Control Channel).

Furthermore, although the present invention is configured with hardware as an example, the present invention can also be implemented with software. For example, functions similar to those of the radio transmission apparatus according to the present invention can be performed by describing an algorithm of the radio transmission method according to the present invention in a programming language, storing this program in a memory and making have an information processing section run the program.

Each function block used to explain the embodiments described above can typically be implemented as an LSI consisting of an integrated circuit. They can be individual chips or they can be partially or completely contained in a single chip.

In addition, here, each function block is described as an LSI, but it can also be referred to as "IC", "LSI system", "super LSI", "ultra LSI" depending on different degrees of integration.

In addition, the circuit integration procedure is not limited to LSIs, and implementation is also possible using dedicated circuits or general purpose processors. After LSI manufacturing, it is also possible

the use of a programmable FPGA (Field Programmable Door Matrix) or a reconfigurable processor in which connections and circuit cell settings within a LSI can be reconfigured.

In addition, if the integrated circuit technology replaces the LSIs as a result of the development of semiconductor technology or a derivative of other technology, it is also naturally possible to carry out the integration of function blocks using this technology. The application in biotechnology is also possible.

This application is based on Japanese Patent Application No. 2005-288300, filed on September 30, 2005. 10 Industrial Applicability

The radio transmission apparatus and the radio transmission method according to the present invention is applicable to a mobile station apparatus, a base station apparatus and the like, in a mobile communication system 15.

Claims (10)

image 1 1. Transmission method for use by a transmission apparatus for transmitting data and control information in a single carrier system, the procedure comprising: 5 determine a first coding rate for the data based on a CQI, the CQI being transmitted from a base station; calculate a second coding rate for the control information; transmit the data using the first encoding rate for the data; Y 10 transmitting the control information using the second coding rate for the control information, in which the second coding rate for the control information is calculated based on both the CQI and a CQI compensation transmitted from the base station, and a CQI compensation value is used to calculate the second coding rate for the control information. fifteen 2. Transmission apparatus for transmitting data and control information in a single carrier system, the apparatus comprising: a unit of determination configured to determine a first coding rate for the data based on 20 a CQI, the CQI being transmitted from a base station; a unit of calculation configured to calculate a second coding rate for the control information; and a transmission unit configured to transmit the data using the first coding rate for the data and the control information using the second coding rate for the control information, wherein the second coding rate for the control information is calculates based on both the CQI and a 25 CQI compensation transmitted from the base station, and a CQI compensation value is used to calculate the second coding rate for the control information. 3. Transmission method according to claim 1, wherein the transmission apparatus is a 30 mobile station, and in which the second coding rate is calculated by the mobile station according to established information contained in the mobile station, the information established defining a relationship between the first coding rate for the data, the CQI compensation , and the second coding rate for the control information. The transmission apparatus according to claim 2, wherein the transmission apparatus is a mobile station, and wherein the second coding rate is calculated by the mobile station according to established information contained in the mobile station , the information defining a relationship between the first coding rate for the data, the CQI compensation, and the second coding rate for the control information. 40

5.

Transmission method according to claim 3 or the transmission apparatus according to claim 4, wherein the established information comprises a look-up table.

6.

Transmission method according to one of claims 1, 3 or 5, the transmission apparatus of

According to one of claims 2, 4 or 5, wherein the total bit length of the CQI compensation is less than a total bit length of the CQI. 7. Receiving procedure for use by a receiving apparatus for receiving control data and information in a single carrier system, the procedure comprising: 50 transmit to a base station; (i) a CQI and (ii) a CQI compensation, receive, from a mobile station, data encoded with the first coding rate determined by the mobile station based on the CQI, and receive, from the mobile station, information of control encoded with a second coding rate 55 in which the second coding rate is calculated by the mobile station based on both the CQI and the CQI compensation, and the mobile station uses a CQI compensation value to calculate the second coding rate for the information of control. 60 8. Receiving apparatus for receiving control data and information in a single carrier system, the apparatus comprising: a transmitter configured to transmit, to a base station; (i) a CQI and (ii) a CQI compensation, and eleven image2 a receiver configured to receive, from the mobile station, data encoded with the first encoding rate that is determined by the mobile station based on the CQI, and to receive, from the mobile station, control information encoded with a second encoding rate , in which the second coding rate is calculated by the mobile station based on both the CQI and the 5 CQI compensation, and the mobile station uses a CQI compensation value to calculate the second coding rate for the control information. 9. Reception method according to claim 7, wherein the second coding rate is 10 calculates by means of the mobile station in accordance with established information contained in the mobile station, the established information defining a relationship between the first coding rate for the data, the CQI compensation, and the second coding rate for the control information. 10. Receiving apparatus according to claim 8, wherein the second coding rate is calculated 15 by the mobile station in accordance with established information contained in the mobile station, the information established defining a relationship between the first coding rate for the data, the CQI compensation, and the second coding rate for the control information. 11. Receiving procedure according to claim 9 or the receiving apparatus according to claim 10, wherein the established information comprises a query table. 12. Receiving method according to one of claims 7, 9 or 11, or the receiving apparatus according to one of claims 8, 10 or 11, wherein the total bit length of the CQI compensation is smaller than a total bit length of the CQI. 25 12